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Hydrolysis Reverses Dehydration Synthesis
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Structural insight into the poly(3-hydroxybutyrate) hydrolysis by intracellular PHB depolymerase from Bacillus

Yung-Lin Wang1, Li-Ci Ye2, San-Chi Chang3

  • 1Institute of Biochemistry and Molecular Biology, National Yang Ming Chiao Tung University, Taipei 112, Taiwan.

International Journal of Biological Macromolecules
|November 26, 2024
PubMed
Summary

The crystal structure of Bacillus thuringiensis PHB depolymerase (BtPhaZ) reveals its unique helical cap domain and catalytic active site. This finding offers insights into biodegradable plastic degradation and (R)-3-hydroxylbutyrates production.

Keywords:
BiodegradationCrystal structurePHB depolymerasePolyhydroxybutyratePolymer-adsorption siteα/β hydrolase

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Area of Science:

  • Biochemistry and Structural Biology
  • Polymer Science and Engineering
  • Microbiology and Biotechnology

Background:

  • Poly((R)-3-hydroxybutyrate) (PHB) is a biodegradable plastic produced by microbes.
  • PHB depolymerase (PhaZ) enzymes catalyze PHB hydrolysis into (R)-3-hydroxylbutyrates (3HB).
  • A novel intracellular PhaZ from Bacillus thuringiensis (BtPhaZ) was identified for potential applications.

Purpose of the Study:

  • To determine the crystal structure of the novel intracellular BtPhaZ.
  • To elucidate the structural basis for BtPhaZ's catalytic activity and substrate specificity.
  • To understand the molecular mechanisms underlying PHB biodegradation by BtPhaZ.

Main Methods:

  • X-ray crystallography was employed to determine the crystal structure of BtPhaZ at 1.42-Å resolution.
  • Bioinformatic analysis was used to identify conserved signatures and compare structural homology with other α/β hydrolases.
  • Structural comparisons were performed to analyze biopolymer-binding and hydrolysis mechanisms.

Main Results:

  • The crystal structure of BtPhaZ, the first for an intracellular PhaZ, reveals a canonical α/β hydrolase catalytic domain and a unique α-helical cap domain.
  • BtPhaZ shares structural homology with other α/β hydrolases but possesses unique conserved signatures contributing to its active-site architecture.
  • The P-1 subsite's limited space suggests specific accommodation for a single 3HB monomer, explaining monomeric product formation, and a hydrophobic cluster in the cap domain acts as a polymer-binding site.

Conclusions:

  • The determined crystal structure provides fundamental insights into the catalytic mechanism and substrate binding of intracellular PHB depolymerases.
  • BtPhaZ's unique structural features, including the helical cap domain and specific active-site architecture, are crucial for its function in PHB biodegradation.
  • Understanding these structural aspects facilitates the development of engineered enzymes for enhanced biodegradable plastic degradation and 3HB production.